Propylene glycol | C3H8O2 - PubChem

from EU Food Improvement Agents; Wikipedia; PubChem .. Propylene glycol,
United States Pharmacopeia (USP) Reference Standard · 1,2-Propanediol,
meets analytical specifiion of Ph. Eur., BP, USP, >=99.5% Although it is
considered safe, large intravenous doses given over a short period of time can
be toxic.